<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>验证用户名和密码</title>
</head>

<body>
    <script>
        var userName = prompt('请输入用户名');
        var password = prompt('请输入密码');
        if (userName == 'admin' && password == '123456') {
            alert('登录成功！');
        } else {
            alert('用户名或密码错误')
        }
    </script>
</body>

</html>